AMTM

Amentum Holdings, Inc.

Insider trading activity for Amentum Holdings, Inc., straight from SEC Form 4 filings. Net figures below count open-market buys and sales only — grants, option exercises and tax withholding are excluded because they are compensation, not decisions to trade.

Past 3 months

net buying

Bought(0 · 0 insiders): $0
Sold(0 · 0 insiders): $0

Past 6 months

net buying

Bought(0 · 0 insiders): $0
Sold(0 · 0 insiders): $0

Past 12 months

net buying

Bought(0 · 0 insiders): $0
Sold(0 · 0 insiders): $0

Transaction history

The 86 most recent Form 4 transactions.

Open in screener →

Insider transactions, newest first: date, security, transaction type, size and a link to the filing each row came from.
Date	Insider	Role	Type	Shares	Price	Value	Δ Own	Filing
Aug 14	Thompson Christopher…	Director	GGIFT	4,250	—	—	-42.5%	Open the original filing on SEC.gov
May 6	Heller John E.	Chief Executive Officer	MEXER◆	18,145	—	—	—	Open the original filing on SEC.gov
May 6	Heller John E.	Chief Executive Officer	FTAX	8,184	$24.89	$203.7K	-2.1%	Open the original filing on SEC.gov
May 6	Heller John E.	Chief Executive Officer	MEXER	18,145	—	—	+5.0%	Open the original filing on SEC.gov
May 6	Mullen Sean Thomas	Chief Growth Officer	MEXER◆	9,072	—	—	—	Open the original filing on SEC.gov
May 6	Mullen Sean Thomas	Chief Growth Officer	FTAX	2,762	$24.89	$68.7K	-7.8%	Open the original filing on SEC.gov
May 6	Mullen Sean Thomas	Chief Growth Officer	MEXER	9,072	—	—	+34.7%	Open the original filing on SEC.gov
May 6	Johnson Travis Barton	Chief Financial Officer	MEXER◆	13,609	—	—	—	Open the original filing on SEC.gov
May 6	Johnson Travis Barton	Chief Financial Officer	FTAX	4,097	$24.89	$102K	-3.4%	Open the original filing on SEC.gov
May 6	Johnson Travis Barton	Chief Financial Officer	MEXER	13,609	—	—	+12.5%	Open the original filing on SEC.gov
May 6	Bruning Jill L	Chief Technology Officer	MEXER◆	9,072	—	—	—	Open the original filing on SEC.gov
May 6	Bruning Jill L	Chief Technology Officer	FTAX	2,731	$24.89	$68K	-1.4%	Open the original filing on SEC.gov
May 6	Bruning Jill L	Chief Technology Officer	MEXER	9,072	—	—	+4.8%	Open the original filing on SEC.gov
May 6	Arnette Stephen A	Chief Operating Officer	MEXER◆	13,609	—	—	—	Open the original filing on SEC.gov
May 6	Arnette Stephen A	Chief Operating Officer	FTAX	3,314	$24.89	$82.5K	-3.0%	Open the original filing on SEC.gov
May 6	Arnette Stephen A	Chief Operating Officer	MEXER	13,609	—	—	+14.1%	Open the original filing on SEC.gov
Mar 4	Bruning Jill L	Chief Technology Officer	GGIFT	30,000	—	—	-13.6%	Open the original filing on SEC.gov
Mar 2	Arnette Stephen A	Chief Operating Officer	MEXER◆	2,808	—	—	—	Open the original filing on SEC.gov
Mar 2	Arnette Stephen A	Chief Operating Officer	FTAX	750	$30.70	$23K	-0.8%	Open the original filing on SEC.gov
Mar 2	Arnette Stephen A	Chief Operating Officer	MEXER	2,808	—	—	+3.0%	Open the original filing on SEC.gov
Feb 17	St. Mary Michele T	Chief Legal Officer & GC	MEXER◆	7,080	—	—	—	Open the original filing on SEC.gov
Feb 17	St. Mary Michele T	Chief Legal Officer & GC	FTAX	2,308	$30.05	$69.4K	-7.9%	Open the original filing on SEC.gov
Feb 17	St. Mary Michele T	Chief Legal Officer & GC	MEXER	7,080	—	—	+31.8%	Open the original filing on SEC.gov
Feb 6	Ireland Susan Leslie	Director	AGRANT	5,062	—	—	+146.8%	Open the original filing on SEC.gov
Feb 6	Rowland Sandra E.	Director	MEXER◆	11,564	—	—	—	Open the original filing on SEC.gov
Feb 6	Rowland Sandra E.	Director	AGRANT	5,062	—	—	+33.7%	Open the original filing on SEC.gov
Feb 6	Rowland Sandra E.	Director	MEXER	11,564	—	—	+335.5%	Open the original filing on SEC.gov
Feb 6	Brooks Vincent K	Director	MEXER◆	11,564	—	—	—	Open the original filing on SEC.gov
Feb 6	Brooks Vincent K	Director	AGRANT	5,062	—	—	+22.6%	Open the original filing on SEC.gov
Feb 6	Brooks Vincent K	Director	MEXER	11,564	—	—	+106.7%	Open the original filing on SEC.gov
Feb 6	Eberhart Ralph E	Director	MEXER◆	11,564	—	—	—	Open the original filing on SEC.gov
Feb 6	Eberhart Ralph E	Director	AGRANT	5,062	—	—	+11.8%	Open the original filing on SEC.gov
Feb 6	Eberhart Ralph E	Director	MEXER	11,564	—	—	+36.7%	Open the original filing on SEC.gov
Feb 6	Loughran Barbara	Director	AGRANT	5,062	—	—	+110.0%	Open the original filing on SEC.gov
Feb 6	Thompson Christopher…	Director	AGRANT	5,062	—	—	—	Open the original filing on SEC.gov
Feb 6	Vollmer John C.	Director	MEXER◆	11,564	—	—	—	Open the original filing on SEC.gov
Feb 6	Vollmer John C.	Director	AGRANT	5,062	—	—	+1.2%	Open the original filing on SEC.gov
Feb 6	Vollmer John C.	Director	MEXER	11,564	—	—	+2.8%	Open the original filing on SEC.gov
Jan 28	Heller John E.	Chief Executive Officer	MEXER◆	51,979	—	—	—	Open the original filing on SEC.gov
Jan 28	Heller John E.	Chief Executive Officer	FTAX	19,768	$35.71	$705.9K	-5.1%	Open the original filing on SEC.gov
Jan 28	Heller John E.	Chief Executive Officer	MEXER	51,979	—	—	+15.6%	Open the original filing on SEC.gov
Dec 17, 2025	Mullen Sean Thomas	Chief Growth Officer	MEXER◆	9,298	—	—	—	Open the original filing on SEC.gov
Dec 17, 2025	Mullen Sean Thomas	Chief Growth Officer	FTAX	4,194	$28.67	$120.2K	-13.8%	Open the original filing on SEC.gov
Dec 17, 2025	Mullen Sean Thomas	Chief Growth Officer	MEXER	9,298	—	—	+44.2%	Open the original filing on SEC.gov
Dec 5, 2025	Burton Darren	Chief People Officer	MEXER◆	2,721	—	—	—	Open the original filing on SEC.gov
Dec 5, 2025	Burton Darren	Chief People Officer	FTAX	1,392	$28.88	$40.2K	-5.6%	Open the original filing on SEC.gov
Dec 5, 2025	Burton Darren	Chief People Officer	MEXER	2,721	—	—	+12.2%	Open the original filing on SEC.gov
Nov 17, 2025	Mullen Sean Thomas	Chief Growth Officer	AGRANT	17,817	—	—	+553.8%	Open the original filing on SEC.gov
Nov 17, 2025	Burton Darren	Chief People Officer	AGRANT	22,271	—	—	—	Open the original filing on SEC.gov
Nov 17, 2025	Johnson Travis Barton	Chief Financial Officer	AGRANT	100,220	—	—	+1,185%	Open the original filing on SEC.gov
Nov 17, 2025	St. Mary Michele T	Chief Legal Officer & GC	AGRANT	22,271	—	—	—	Open the original filing on SEC.gov
Nov 17, 2025	Demetriou Steven J.	Executive Chair	MEXER◆	43,396	—	—	—	Open the original filing on SEC.gov
Nov 17, 2025	Demetriou Steven J.	Executive Chair	AGRANT	111,355	—	—	+15.7%	Open the original filing on SEC.gov
Nov 17, 2025	Demetriou Steven J.	Executive Chair	FTAX	17,077	$21.49	$367K	-2.4%	Open the original filing on SEC.gov
Nov 17, 2025	Demetriou Steven J.	Executive Chair	MEXER	43,396	—	—	+6.4%	Open the original filing on SEC.gov
Nov 16, 2025	Arnette Stephen A	Chief Operating Officer	MEXER◆	4,596	—	—	—	Open the original filing on SEC.gov
Nov 16, 2025	Arnette Stephen A	Chief Operating Officer	MEXER◆	3,681	—	—	—	Open the original filing on SEC.gov
Nov 16, 2025	Arnette Stephen A	Chief Operating Officer	MEXER◆	5,053	—	—	—	Open the original filing on SEC.gov
Nov 16, 2025	Arnette Stephen A	Chief Operating Officer	FTAX	1,120	$22.07	$24.7K	-2.4%	Open the original filing on SEC.gov
Nov 16, 2025	Arnette Stephen A	Chief Operating Officer	MEXER	4,596	—	—	+10.8%	Open the original filing on SEC.gov
Nov 16, 2025	Arnette Stephen A	Chief Operating Officer	FTAX	897	$22.07	$19.8K	-2.1%	Open the original filing on SEC.gov
Nov 16, 2025	Arnette Stephen A	Chief Operating Officer	MEXER	3,681	—	—	+9.3%	Open the original filing on SEC.gov
Nov 16, 2025	Arnette Stephen A	Chief Operating Officer	FTAX	1,231	$22.07	$27.2K	-3.0%	Open the original filing on SEC.gov
Nov 16, 2025	Arnette Stephen A	Chief Operating Officer	MEXER	5,053	—	—	+14.0%	Open the original filing on SEC.gov
Nov 15, 2025	Arnette Stephen A	Chief Operating Officer	MEXER◆	5,758	—	—	—	Open the original filing on SEC.gov
Nov 15, 2025	Arnette Stephen A	Chief Operating Officer	FTAX	1,403	$22.07	$31K	-3.8%	Open the original filing on SEC.gov
Nov 15, 2025	Arnette Stephen A	Chief Operating Officer	MEXER	5,758	—	—	+18.2%	Open the original filing on SEC.gov
Nov 6, 2025	Johnson Travis Barton	Chief Financial Officer	MEXER◆	12,097	—	—	—	Open the original filing on SEC.gov
Nov 6, 2025	Johnson Travis Barton	Chief Financial Officer	FTAX	3,642	$21.79	$79.4K	-30.1%	Open the original filing on SEC.gov
Nov 6, 2025	Johnson Travis Barton	Chief Financial Officer	MEXER	12,097	—	—	—	Open the original filing on SEC.gov
Nov 6, 2025	Bruning Jill L	Chief Technology Officer	MEXER◆	4,838	—	—	—	Open the original filing on SEC.gov
Nov 6, 2025	Bruning Jill L	Chief Technology Officer	FTAX	1,457	$21.79	$31.7K	-30.1%	Open the original filing on SEC.gov
Nov 6, 2025	Bruning Jill L	Chief Technology Officer	MEXER	4,838	—	—	—	Open the original filing on SEC.gov
Nov 6, 2025	Heller John E.	Chief Executive Officer	MEXER◆	39,617	—	—	—	Open the original filing on SEC.gov
Nov 6, 2025	Heller John E.	Chief Executive Officer	FTAX	17,868	$21.79	$389.3K	-13.6%	Open the original filing on SEC.gov
Nov 6, 2025	Heller John E.	Chief Executive Officer	MEXER	39,617	—	—	+43.2%	Open the original filing on SEC.gov
Nov 6, 2025	Mullen Sean Thomas	Chief Growth Officer	MEXER◆	4,838	—	—	—	Open the original filing on SEC.gov
Nov 6, 2025	Mullen Sean Thomas	Chief Growth Officer	FTAX	1,621	$21.79	$35.3K	-33.5%	Open the original filing on SEC.gov
Nov 6, 2025	Mullen Sean Thomas	Chief Growth Officer	MEXER	4,838	—	—	—	Open the original filing on SEC.gov
Nov 6, 2025	Arnette Stephen A	Chief Operating Officer	MEXER◆	12,701	—	—	—	Open the original filing on SEC.gov
Nov 6, 2025	Arnette Stephen A	Chief Operating Officer	FTAX	3,093	$21.79	$67.4K	-8.9%	Open the original filing on SEC.gov
Nov 6, 2025	Arnette Stephen A	Chief Operating Officer	MEXER	12,701	—	—	+57.7%	Open the original filing on SEC.gov
May 8, 2025	Lindsay Goldberg…	10% Owner	JOTHER	1.1M	—	—	+2.6%	Open the original filing on SEC.gov
May 8, 2025	Goldberg Alan E	Director, 10% Owner	JOTHER	1.1M	—	—	+2.6%	Open the original filing on SEC.gov
May 8, 2025	Goldberg 2014 LLC	10% Owner	JOTHER	1.1M	—	—	+2.6%	Open the original filing on SEC.gov
May 8, 2025	Amentum Joint Venture…	Director	JOTHER	2.4M	—	—	-100.0%	Open the original filing on SEC.gov

GGIFT—

Thompson Christopher… · DirectorAug 14

4,250 sh · -42.5% own

MEXER◆—

Heller John E. · Chief Executive…May 6

18,145 sh

FTAX$203.7K

Heller John E. · Chief Executive…May 6

8,184 sh @ $24.89 · -2.1% own

MEXER—

Heller John E. · Chief Executive…May 6

18,145 sh · +5.0% own

MEXER◆—

Mullen Sean Thomas · Chief Growth…May 6

9,072 sh

FTAX$68.7K

Mullen Sean Thomas · Chief Growth…May 6

2,762 sh @ $24.89 · -7.8% own

MEXER—

Mullen Sean Thomas · Chief Growth…May 6

9,072 sh · +34.7% own

MEXER◆—

Johnson Travis Barton · Chief Financial…May 6

13,609 sh

FTAX$102K

Johnson Travis Barton · Chief Financial…May 6

4,097 sh @ $24.89 · -3.4% own

MEXER—

Johnson Travis Barton · Chief Financial…May 6

13,609 sh · +12.5% own

MEXER◆—

Bruning Jill L · Chief Technology…May 6

9,072 sh

FTAX$68K

Bruning Jill L · Chief Technology…May 6

2,731 sh @ $24.89 · -1.4% own

MEXER—

Bruning Jill L · Chief Technology…May 6

9,072 sh · +4.8% own

MEXER◆—

Arnette Stephen A · Chief Operating…May 6

13,609 sh

FTAX$82.5K

Arnette Stephen A · Chief Operating…May 6

3,314 sh @ $24.89 · -3.0% own

MEXER—

Arnette Stephen A · Chief Operating…May 6

13,609 sh · +14.1% own

GGIFT—

Bruning Jill L · Chief Technology…Mar 4

30,000 sh · -13.6% own

MEXER◆—

Arnette Stephen A · Chief Operating…Mar 2

2,808 sh

FTAX$23K

Arnette Stephen A · Chief Operating…Mar 2

750 sh @ $30.70 · -0.8% own

MEXER—

Arnette Stephen A · Chief Operating…Mar 2

2,808 sh · +3.0% own

MEXER◆—

St. Mary Michele T · Chief Legal…Feb 17

7,080 sh

FTAX$69.4K

St. Mary Michele T · Chief Legal…Feb 17

2,308 sh @ $30.05 · -7.9% own

MEXER—

St. Mary Michele T · Chief Legal…Feb 17

7,080 sh · +31.8% own

AGRANT—

Ireland Susan Leslie · DirectorFeb 6

5,062 sh · +146.8% own

MEXER◆—

Rowland Sandra E. · DirectorFeb 6

11,564 sh

AGRANT—

Rowland Sandra E. · DirectorFeb 6

5,062 sh · +33.7% own

MEXER—

Rowland Sandra E. · DirectorFeb 6

11,564 sh · +335.5% own

MEXER◆—

Brooks Vincent K · DirectorFeb 6

11,564 sh

AGRANT—

Brooks Vincent K · DirectorFeb 6

5,062 sh · +22.6% own

MEXER—

Brooks Vincent K · DirectorFeb 6

11,564 sh · +106.7% own

MEXER◆—

Eberhart Ralph E · DirectorFeb 6

11,564 sh

AGRANT—

Eberhart Ralph E · DirectorFeb 6

5,062 sh · +11.8% own

MEXER—

Eberhart Ralph E · DirectorFeb 6

11,564 sh · +36.7% own

AGRANT—

Loughran Barbara · DirectorFeb 6

5,062 sh · +110.0% own

AGRANT—

Thompson Christopher… · DirectorFeb 6

5,062 sh

MEXER◆—

Vollmer John C. · DirectorFeb 6

11,564 sh

AGRANT—

Vollmer John C. · DirectorFeb 6

5,062 sh · +1.2% own

MEXER—

Vollmer John C. · DirectorFeb 6

11,564 sh · +2.8% own

MEXER◆—

Heller John E. · Chief Executive…Jan 28

51,979 sh

FTAX$705.9K

Heller John E. · Chief Executive…Jan 28

19,768 sh @ $35.71 · -5.1% own

MEXER—

Heller John E. · Chief Executive…Jan 28

51,979 sh · +15.6% own

MEXER◆—

Mullen Sean Thomas · Chief Growth…Dec 17, 2025

9,298 sh

FTAX$120.2K

Mullen Sean Thomas · Chief Growth…Dec 17, 2025

4,194 sh @ $28.67 · -13.8% own

MEXER—

Mullen Sean Thomas · Chief Growth…Dec 17, 2025

9,298 sh · +44.2% own

MEXER◆—

Burton Darren · Chief People…Dec 5, 2025

2,721 sh

FTAX$40.2K

Burton Darren · Chief People…Dec 5, 2025

1,392 sh @ $28.88 · -5.6% own

MEXER—

Burton Darren · Chief People…Dec 5, 2025

2,721 sh · +12.2% own

AGRANT—

Mullen Sean Thomas · Chief Growth…Nov 17, 2025

17,817 sh · +553.8% own

AGRANT—

Burton Darren · Chief People…Nov 17, 2025

22,271 sh

AGRANT—

Johnson Travis Barton · Chief Financial…Nov 17, 2025

100,220 sh · +1,185% own

AGRANT—

St. Mary Michele T · Chief Legal…Nov 17, 2025

22,271 sh

MEXER◆—

Demetriou Steven J. · Executive ChairNov 17, 2025

43,396 sh

AGRANT—

Demetriou Steven J. · Executive ChairNov 17, 2025

111,355 sh · +15.7% own

FTAX$367K

Demetriou Steven J. · Executive ChairNov 17, 2025

17,077 sh @ $21.49 · -2.4% own

MEXER—

Demetriou Steven J. · Executive ChairNov 17, 2025

43,396 sh · +6.4% own

MEXER◆—

Arnette Stephen A · Chief Operating…Nov 16, 2025

4,596 sh

MEXER◆—

Arnette Stephen A · Chief Operating…Nov 16, 2025

3,681 sh

MEXER◆—

Arnette Stephen A · Chief Operating…Nov 16, 2025

5,053 sh

FTAX$24.7K

Arnette Stephen A · Chief Operating…Nov 16, 2025

1,120 sh @ $22.07 · -2.4% own

MEXER—

Arnette Stephen A · Chief Operating…Nov 16, 2025

4,596 sh · +10.8% own

FTAX$19.8K

Arnette Stephen A · Chief Operating…Nov 16, 2025

897 sh @ $22.07 · -2.1% own

MEXER—

Arnette Stephen A · Chief Operating…Nov 16, 2025

3,681 sh · +9.3% own

FTAX$27.2K

Arnette Stephen A · Chief Operating…Nov 16, 2025

1,231 sh @ $22.07 · -3.0% own

MEXER—

Arnette Stephen A · Chief Operating…Nov 16, 2025

5,053 sh · +14.0% own

MEXER◆—

Arnette Stephen A · Chief Operating…Nov 15, 2025

5,758 sh

FTAX$31K

Arnette Stephen A · Chief Operating…Nov 15, 2025

1,403 sh @ $22.07 · -3.8% own

MEXER—

Arnette Stephen A · Chief Operating…Nov 15, 2025

5,758 sh · +18.2% own

MEXER◆—

Johnson Travis Barton · Chief Financial…Nov 6, 2025

12,097 sh

FTAX$79.4K

Johnson Travis Barton · Chief Financial…Nov 6, 2025

3,642 sh @ $21.79 · -30.1% own

MEXER—

Johnson Travis Barton · Chief Financial…Nov 6, 2025

12,097 sh

MEXER◆—

Bruning Jill L · Chief Technology…Nov 6, 2025

4,838 sh

FTAX$31.7K

Bruning Jill L · Chief Technology…Nov 6, 2025

1,457 sh @ $21.79 · -30.1% own

MEXER—

Bruning Jill L · Chief Technology…Nov 6, 2025

4,838 sh

MEXER◆—

Heller John E. · Chief Executive…Nov 6, 2025

39,617 sh

FTAX$389.3K

Heller John E. · Chief Executive…Nov 6, 2025

17,868 sh @ $21.79 · -13.6% own

MEXER—

Heller John E. · Chief Executive…Nov 6, 2025

39,617 sh · +43.2% own

MEXER◆—

Mullen Sean Thomas · Chief Growth…Nov 6, 2025

4,838 sh

FTAX$35.3K

Mullen Sean Thomas · Chief Growth…Nov 6, 2025

1,621 sh @ $21.79 · -33.5% own

MEXER—

Mullen Sean Thomas · Chief Growth…Nov 6, 2025

4,838 sh

MEXER◆—

Arnette Stephen A · Chief Operating…Nov 6, 2025

12,701 sh

FTAX$67.4K

Arnette Stephen A · Chief Operating…Nov 6, 2025

3,093 sh @ $21.79 · -8.9% own

MEXER—

Arnette Stephen A · Chief Operating…Nov 6, 2025

12,701 sh · +57.7% own

JOTHER—

Lindsay Goldberg… · 10% OwnerMay 8, 2025

1.1M sh · +2.6% own

JOTHER—

Goldberg Alan E · Director, 10%…May 8, 2025

1.1M sh · +2.6% own

JOTHER—

Goldberg 2014 LLC · 10% OwnerMay 8, 2025

1.1M sh · +2.6% own

JOTHER—

Amentum Joint Venture… · DirectorMay 8, 2025

2.4M sh · -100.0% own

Filing record

How quickly insiders here report their trades. Section 16 allows two business days from the transaction.

1 of 34 filings we hold was filed after the two-business-day deadline. The furthest past the deadline was 21 business days late.

Form 4 filings made after the two-business-day deadline, with the transaction date, the filing date and the number of business days between them.
Traded	Filed	Insider	Past deadline	Largest line	Source
Aug 14	Sep 17	Thompson Christopher M.T.Director	21days	—	Filing ↗

Thompson Christopher M.T.Director

21days

Traded Aug 14 · filed Sep 17Filing ↗

Counted in business days from the transaction date, or the deemed execution date where the filing reports one, excluding weekends and federal holidays. How this is measured · All late filings

Insiders at this company

Everyone who has filed a Form 4 for this issuer.

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